This week, The Washington Post becomes the first publisher to add subscription eBook data from Amazon to its Bestselling Books lists, offering readers the most comprehensive look at what books people are buying each week. The Post’s new fiction and nonfiction Bestsellers lists, which also incorporate data from NPD BookScan, account for sales of hardcover, paperback, and eBooks, including those books borrowed via Amazon’s Prime Reading and Kindle Unlimited.

“Readers have long turned to The Post’s books coverage for reviews and recommendations from some of the top book critics in the nation. The new Bestsellers lists add to the breadth of our books coverage by giving readers a truer sense of what books are being sold each week,” said Mitch Rubin, deputy features editor at The Post.

The Post is also the first publisher to syndicate Amazon Charts Most Read list, measuring the books millions of Amazon customers are really reading and listening to by looking at the average number of daily Kindle readers and Audible listeners each week. Additionally, The Post is also offering readers a view into what books are being read in the nation’s capital with a Most Read Books D.C. list, powered by Amazon Charts.

“The ways in which customers read books have evolved, with people reading digitally, listening to audio books, and subscribing to reading membership programs like Kindle Unlimited or Prime Reading,” said David Naggar, vice president, Amazon. “We’re excited to collaborate with The Washington Post to give book lovers a more comprehensive U.S. bestseller list to help them discover their next great read.”

The Post’s lists are backed by new in-house technology, called Bradbury, which speeds the editing process using a streamlined workflow, allowing a single editor to create far more lists in much less time. Bradbury enables The Post to automatically import data from multiple sources and opens up the opportunity to syndicate its lists via an API. Heliograf, The Post’s automated storytelling system, will be used to generate a data-driven weekly synopsis detailing any movement on the list from the week prior, including noting fastest rising titles, authors, new additions and historic performance on the list. Titles in the lists will also link back to the Post review of the book when applicable.

“Bradbury allows Post editors to create even more lists like all-new titles or the longest tenured authors and to expand into new topic areas like television, movies or music—all without increasing the human workload,” said Jeremy Gilbert, director of strategic initiatives at The Post.